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Dodge Engineering & Controls, Inc.
Toll Free (877) 334-2875 Fax: (978) 244-1422
Installation
ES142 Spring Return Electronic Actuators
129-270 EAI/ES-17 DEI, Inc.
Sizing Actuators for Damper Applications
The number of actuators required depends on several factors. To determine the quantity of actuators required for
the installation:
1. Obtain damper torque ratings (ft-lb/ft
2
or Nm/m
2
) from the damper manufacturer.
2. Determine the area of the damper.
3. Calculate the total torque required to move the damper:
Total Torque = Torque Rating x Damper Area
4. Select the total quantity of actuators, required:
Number of Actuators =
Total Damper Torque required
SF
(see note
below)
Actuator Torque
(refer to
specifications)
x
NOTE: When calculating the number of actuators required, a safety factor (SF) should be included for
unaccountable variables such as slight misalignments, aging of the damper, etc. A suggested
safety factor is 0.80 (or 80% of the rated torque).
Mechanical coupling of the actuator is allowed if:
• The same type of actuator is used.
• The operating voltage is within the tolerance.